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v3.23.3

Summary of restricted stock activity under the Plan (Details) - Restricted Stock [Member] - $ / shares | 6 Months Ended |  |
--- | --- | --- | ---
Oct. 31, 2023 | Oct. 31, 2022 | Apr. 30, 2023 | Apr. 30, 2020
[custom:ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockUnvestedAndOutstandingNumber-0] | 779,850 |  | 781,060 | 1,083,675
[custom:SharebasedCompensationSharesRestrictedStockUnvestedAndOutstandingWeightedAverageExercisePrice-0] | $ 2.11 |  | $ 2.44 | $ 2.59
[custom:ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockGrantsInPeriodGross] | 298,643 | 780,884 |  |
[custom:ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockGrantsInPeriodWeightedAverageGrantDateFairValue] | $ 1.06 | $ 2.14 |  |
[custom:SharebasedCompensationArrangementBySharebasedPaymentAwardRestrictedStockNumberVestedInPeriod] | (229,197) | (1,062,372) |  |
[custom:ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockNumberVestedInPeriodWeightedAverageGrantDateFairValue] | $ 1.92 | $ 2.42 |  |
[custom:SharebasedCompensationArrangementBySharebasedPaymentAwardRestrictedStockNonvestedOptionsForfeitedNumberOfShares] | 70,656 | (21,127) |  |
[custom:ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice] | $ 1.25 | $ 2.13 |  |
[custom:SharebasedCompensationArrangementBySharebasedPaymentAwardRestrictedStockNonvestedOptionsForfeitedNumberOfShares] | (70,656) | 21,127 |  |

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